Display substrate, manufacturing method, display apparatus and mask

ABSTRACT

The present disclosure provides a display substrate, a manufacturing method thereof, a display apparatus and a mask. In the display substrate, a pixel unit at least includes a first sub-pixel, a second sub-pixel and a third sub-pixel, a luminance brightness ratio of the first sub-pixel is greater than a luminance brightness ratio of the second sub-pixel, and the luminance brightness ratio of the second sub-pixel is greater than a luminance brightness ratio of the third sub-pixel. The first sub-pixel and the second sub-pixel are located in a first column, the third sub-pixel is located in a second column, and the plurality of pixel units includes a plurality of first pixel units and a plurality of second pixel units.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims a priority to Chinese Patent Application No.202110209752.9 filed on Feb. 24, 2021, which is incorporated herein byreference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of display technology, inparticular to a display substrate, a manufacturing method thereof, adisplay apparatus and a mask.

BACKGROUND

For an Active Matrix Organic Light-Emitting Diode (AMOLED) displaypanel, red, green and blue sub-pixels need to be provided to realizecolor display based on the principle of spatial color mixing. Currently,as a development trend, a resolution of the display panel becomes higherand higher, and the image quality is highly demanded. However, the red,green and blue sub-pixels of the AMOLED display panel are formed throughevaporation, and a Fine Metal Mask (FMM) with excellent mechanicalstability is required. Due to the limitation of an FMM processcapability, it is impossible to meet the requirement on the highresolution. Hence, dummy pixels are commonly used in the industry atpresent, and the red and blue sub-pixels are reused so as to reduce thequantity of red and blue sub-pixels, thereby to achieve the highresolution and meet the requirement on the FMM process.

Although the high resolution is achieved theoretically through the dummypixels, a partial distortion and some visual defects, e.g., pixelgrains, serrations and colored edges, inevitably occur for an imagedisplayed by the display panel, and thereby a display effect of thedisplay panel is adversely affected.

SUMMARY

An object of the present disclosure is to provide a display substrate, amanufacturing method thereof, a display apparatus and a mask, so as tosolve the problems in the related art.

In order to achieve the above object, the present disclosure providesthe following technical solutions.

In one aspect, the present disclosure provides in some embodiments adisplay substrate, including a base substrate and a plurality of pixelunits arranged in an array form on the base substrate. Each pixel unitat least includes a first sub-pixel, a second sub-pixel and a thirdsub-pixel, a luminance brightness ratio of the first sub-pixel isgreater than a luminance brightness ratio of the second sub-pixel, andthe luminance brightness ratio of the second sub-pixel is greater than aluminance brightness ratio of the third sub-pixel. In a first direction,the first sub-pixel and the second sub-pixel are located in a firstcolumn, the third sub-pixel is located in a second column, and the firstcolumn and the second column are arranged in a second direction crossingthe first direction. The plurality of pixel units includes a pluralityof first pixel units and a plurality of second pixel units, and thefirst sub-pixel and the second sub-pixel in the first pixel unit arearranged in an order opposite to the first sub-pixel and the secondsub-pixel in the second pixel unit in the first direction. The pluralityof pixel units is arranged in rows and columns, the first pixel unitsand the second pixel units in each row are arranged alternately, adistance between the first sub-pixels is less than a distance betweenthe second sub-pixels in the first pixel unit and the second pixel unitadjacent to each other, and the first sub-pixels and the secondsub-pixels in the pixel units in each column are arranged in a samecolumn in the first direction.

In a possible embodiment of the present disclosure, in the pixel unitsin each row, at least a part of first sub-pixels in the first pixelunits are staggered from at least a part of second sub-pixels in thesecond pixel units in the first direction, and in the pixel units ineach row, at least a part of second sub-pixels in the first pixel unitsare staggered from at least a part of first sub-pixels in the secondpixel units in the first direction.

In a possible embodiment of the present disclosure, in the pixel unitsin each row, at least a part of third sub-pixels in the first pixelunits are staggered from at least a part of third sub-pixels in thesecond pixel units in the first direction.

In a possible embodiment of the present disclosure, the third sub-pixelsin the pixel units in each row have a same height in the firstdirection.

In a possible embodiment of the present disclosure, in the pixel unitsin each row, a height of the third sub-pixel in each first pixel unit isthe same as a height of the first sub-pixel in each second pixel unit inthe first direction.

In a possible embodiment of the present disclosure, in each of the firstpixel units and the second pixel units, a pixel brightness center of apixel including the first sub-pixel, the second sub-pixel and the thirdsub-pixel is located between the first sub-pixel and the secondsub-pixel, and a distance L1 between the pixel brightness center and acenter of gravity of the first sub-pixel in the pixel unit to which thefirst sub-pixel belongs satisfies L1=(⅓) L, where L is a distancebetween the center of gravity of the first sub-pixel and a center ofgravity of the second sub-pixel in the same pixel unit. In the pixelunits in each row, the pixel brightness center of the first pixel unitand the pixel brightness center of the second pixel unit are located inthe same row in the second direction, and the pixel brightness centersin the pixel units are arranged evenly in an array form in the firstdirection and the second direction.

In a possible embodiment of the present disclosure, the pixel units ineach column includes a plurality of first pixel units or a plurality ofsecond pixel units.

In a possible embodiment of the present disclosure, the first sub-pixelsand the second sub-pixels are arranged alternately and spaced apart fromeach other at a same interval in the pixel units in each column.

In a possible embodiment of the present disclosure, the first pixelunits and the second pixel units are arranged alternately in the firstdirection in the pixel units in each column.

In a possible embodiment of the present disclosure, the first sub-pixel,the second sub-pixel and the third sub-pixel are each of a rectangularshape, and a long side of the third sub-pixel extends in the firstdirection.

In a possible embodiment of the present disclosure, the first sub-pixelincludes a green sub-pixel, the second sub-pixel includes a redsub-pixel and the third sub-pixel includes a blue sub-pixel.

In a possible embodiment of the present disclosure, in each pixel unit,a distance between a center of gravity of the first sub-pixel and acenter of gravity of the second sub-pixel, a distance between the centerof gravity of the first sub-pixel and a center of gravity of the thirdsub-pixel, and a distance between the center of gravity of the secondsub-pixel and the center of gravity of the third sub-pixel are the same.

In another aspect, the present disclosure provides in some embodiments adisplay apparatus including the above-mentioned display substrate.

In yet another aspect, the present disclosure provides in someembodiments a mask, including a mask body and a plurality of pixelapertures formed in the mask body. The plurality of pixel aperturesincludes pixel apertures arranged in columns in a second direction, thepixel apertures in each column include a plurality of pixel aperturesarranged in a first direction crossing the second direction, and aportion of the mask body between two adjacent columns of pixel aperturesextends in the first direction.

In a possible embodiment of the present disclosure, the pixel aperturesin odd-numbered columns are at least partially staggered from the pixelapertures in even-numbered columns in the first direction.

In a possible embodiment of the present disclosure, the plurality ofpixel apertures includes a plurality of pixel apertures arranged in rowsin the first direction, the pixel apertures in each row include aplurality of pixel apertures arranged in the second direction, and thepixel apertures in each row have a same height in the first direction.

In still yet another aspect, the present disclosure provides in someembodiments a method for manufacturing a display substrate. The displaysubstrate includes a base substrate and a plurality of pixel unitsarranged in an array form on the base substrate, the plurality of pixelunits is arranged in rows and columns, and each pixel unit at leastincludes a first sub-pixel, a second sub-pixel and a third sub-pixel.The method includes forming at least one of the first sub-pixel, thesecond sub-pixel and the third sub-pixel through the above-mentionedmask. The first sub-pixel and the second sub-pixel are located in afirst column, the third sub-pixel is located in a second column, aluminance brightness ratio of the first sub-pixel is greater than aluminance brightness ratio of the second sub-pixel, and the luminancebrightness ratio of the second sub-pixel is greater than a luminancebrightness ratio of the third sub-pixel. The plurality of pixel unitsincludes a plurality of first pixel units and a plurality of secondpixel units. In the first pixel unit, the first sub-pixel is close to afirst end of the third sub-pixel, and the second sub-pixel is close to asecond end of the third sub-pixel. In the second pixel unit, the firstsub-pixel is close to a second end of the third sub-pixel, and thesecond sub-pixel is close to a first end of the third sub-pixel. Thefirst pixel units and the second pixel units are arranged alternately inthe pixel units in each row, and in the first pixel unit and the secondpixel unit adjacent to each other, a distance between the firstsub-pixels is less than a distance between the second sub-pixels. Thefirst sub-pixels and the second sub-pixels in the pixel units in eachcolumn are located in a same column.

According to the embodiments of the present disclosure, the luminancebrightness ratio of the first sub-pixel is greater than the luminancebrightness ratio of the second sub-pixel, the luminance brightness ratioof the second sub-pixel is greater than the luminance brightness ratioof the third sub-pixel, the first sub-pixel and the second sub-pixel arelocated in the first column, and the third sub-pixel is located in thesecond column, so that the brightness center is located between thefirst sub-pixel and the second sub-pixel in each pixel unit. Inaddition, the luminance brightness ratio of the first sub-pixel is thegreatest, so the brightness center in each pixel unit is closer to thefirst sub-pixel.

BRIEF DESCRIPTION OF THE DRAWINGS

The following drawings are provided to facilitate the understanding ofthe present disclosure, and constitute a portion of the description.These drawings and the following embodiments are for illustrativepurposes only, but shall not be construed as limiting the presentdisclosure. In these drawings,

FIG. 1 is a schematic view showing the arrangement of diamond-shapedRGBG dummy pixels;

FIG. 2 is a schematic view showing lines connecting centers of thediamond-shaped RGBG dummy pixels;

FIG. 3 is a schematic view showing pixel units in one row in FIG. 2 ;

FIG. 4 is a schematic view showing a structure of a first pixel unit anda second pixel unit adjacent to each other according to one embodimentof the present disclosure;

FIG. 5 is a schematic view showing the layout of the pixel unitsaccording to one embodiment of the present disclosure;

FIG. 6 is a schematic view showing the layout of the pixel units andcorresponding pixel apertures according to one embodiment of the presentdisclosure;

FIG. 7 is another schematic view showing the structure of the firstpixel unit and the second pixel unit adjacent to each other according toone embodiment of the present disclosure;

FIG. 8 is another schematic view showing the layout of the pixel unitsaccording to one embodiment of the present disclosure;

FIG. 9 is another schematic view showing the layout of the pixel unitsand the corresponding pixel apertures according to one embodiment of thepresent disclosure;

FIG. 10 is a schematic view showing the layout of a mask according toone embodiment of the present disclosure;

FIG. 11 is another schematic view showing the layout of the maskaccording to one embodiment of the present disclosure; and

FIG. 12 is yet another schematic view showing the layout of the maskaccording to one embodiment of the present disclosure.

DETAILED DESCRIPTION

The present disclosure will be described hereinafter in conjunction withthe drawings and embodiments.

In order to meet the requirement on high image quality, a resolution ofa display apparatus increases gradually. At present, dummy pixels arewidely used in the industry to reduce the quantity of sub-pixels throughreusing some sub-pixels, so as to reduce a process difficulty in an FMMfor evaporation.

FIG. 1 shows the arrangement of a diamond-shaped RGBG dummy pixel, whereadjacent dummy pixels on the left and the right share an R sub-pixel anda B sub-pixel, so that the quantity of R sub-pixels and B sub-pixels ishalved, and the quantity of G sub-pixels remains unchanged.

For the display apparatus, a color image is formed on the basis of threeprimary colors, i.e., red, green and blue, which are consistent withcolors sensed by red cone cells, green cone cells and blue cone cells ona retina of human-being. As a basic imaging process of human eyes, aphotosensitive cell is simulated with light to generate an electricpulse for stimulating a nerve center, thereby to form an image of ascene in the brain. The human eye has different capabilities forbrightness and colors. For example, the human eye has a greatestcapability for green, and a smallest capability for blue. Contributionof the green sub-pixel to the brightness occupies about 65% of the totalbrightness, contribution of the red sub-pixel to the brightness occupiesabout 30% of the total brightness, and contribution of the bluesub-pixel to the brightness merely occupies about 5% of the totalbrightness. Hence, a pixel brightness center A of a pixel including theRGB sub-pixels is approximately located on a line connecting a center ofgravity of the G sub-pixel and the R sub-pixel at a position close tothe G sub-pixel at a distance of ⅓ of a length of the line.

FIG. 2 shows the lines connecting the brightness centers A of thediamond-shaped RGBG dummy pixels. As shown in FIG. 2 , brightnesscenters A of adjacent white points adjacent to each other in ahorizontal direction (i.e., white points each including the RGBsub-pixels) are spaced apart from each other at different distances, andthe brightness centers A are distributed in a serrated or wave-likemanner rather than on a straight line in a longitudinal direction.Hence, the brightness centers A of the white points are distributedunevenly as a whole, and thereby grains and serrations occur for animage.

In addition, FIG. 3 shows a situation where a single horizontal line isdisplayed through the RGBG sub-pixels. As shown in FIG. 3 , the Rsub-pixels and the B sub-pixels are arranged at an upper edge, and the Gsub-pixels are arranged at a lower edge. The sensitivities of the humaneye to the brightness of the RGB sub-pixels are greatly different, sosuch a colored edge phenomenon with a purplish-red upper edge and agreenish lower edge occurs visually.

As shown in FIGS. 4, 5, 7 and 8 , the present disclosure provides insome embodiments a display substrate, which includes a base substrateand a plurality of pixel units arranged in an array form on the basesubstrate. Each pixel unit at least includes a first sub-pixel 1, asecond sub-pixel 2 and a third sub-pixel 3, a luminance brightness ratioof the first sub-pixel 1 is greater than a luminance brightness ratio ofthe second sub-pixel 2, and the luminance brightness ratio of the secondsub-pixel 2 is greater than a luminance brightness ratio of the thirdsub-pixel 3. In a first direction, the first sub-pixel 1 and the secondsub-pixel 2 are located in a first column, the third sub-pixel 3 islocated in a second column, and the first column and the second columnare arranged in a second direction crossing the first direction. Theplurality of pixel units includes a plurality of first pixel units and aplurality of second pixel units, and the first sub-pixel 1 and thesecond sub-pixel 2 in the first pixel unit are arranged in an orderopposite to the first sub-pixel and the second sub-pixel in the secondpixel unit in the first direction. The plurality of pixel units isarranged in rows and columns, the first pixel units and the second pixelunits in each row are arranged alternately, a distance between the firstsub-pixels 1 is less than a distance between the second sub-pixels 2 inthe first pixel unit and the second pixel unit adjacent to each other,and the first sub-pixels 1 and the second sub-pixels 2 in the pixelunits in each column are arranged in a same column in the firstdirection.

Illustratively, the display substrate further includes a plurality ofsub-pixel driving circuitries distributed in an array form and arrangedbetween the plurality of pixel units and the base substrate. Eachsub-pixel corresponds to one sub-pixel driving circuitry, and it emitslight under the effect of a driving signal provided by the correspondingsub-pixel driving circuitry.

Illustratively, the first sub-pixel 1, the second sub-pixel 2 and thethird sub-pixel 3 each include a pixel aperture region and acorresponding organic light-emitting material layer, and at least a partof the organic light-emitting material layer is located in the pixelaperture region.

Illustratively, the luminance brightness ratio of the sub-pixel refersto the contribution of the sub-pixel to the brightness. Illustratively,the first sub-pixel 1 contributes 65% to the brightness, the secondsub-pixel 2 contributes 30% to the brightness, and the third sub-pixel 3contributes 5% to the brightness.

Illustratively, the first direction includes a longitudinal directionand the second direction includes a horizontal direction.Illustratively, in each pixel unit, in the first direction, the firstsub-pixel 1 and the second sub-pixel 2 are located in the first column,the third sub-pixel 3 is located in the second column, the first columnand the second column are arranged in the second direction, and linesconnecting a center of gravity of the first sub-pixel 1, a center ofgravity of the second sub-pixel 2 and a center of gravity of the thirdsub-pixel 3 form a triangle.

Illustratively, the first sub-pixel 1 is arranged at a lower side of thefirst pixel unit and the second sub-pixel 2 is arranged at an upper sideof the first pixel unit. The first sub-pixel 1 is arranged at an upperside of the second pixel unit, and the second sub-pixel 2 is arranged ata lower side of the second pixel unit.

Illustratively, the plurality of pixel units is arranged rows andcolumns. The rows of pixel units are arranged in the first direction,and the first pixel units and the second pixel units are arrangedalternately in the second direction in each row. The columns of pixelunits are arranged in the second direction, and the pixel units in eachcolumn include a plurality of pixel units arranged in the firstdirection.

Illustratively, in the pixel units in each row, the distance between thefirst sub-pixels 1 is less than the distance between the secondsub-pixels 2 in the first pixel unit and the second pixel unit adjacentto each other.

Illustratively, in the pixel units in each column, the first sub-pixels1 and the second sub-pixels 2 are located in a same column in the firstdirection, and the third sub-pixels 3 are located in a same column inthe first direction.

Illustratively, as shown in FIG. 4 , a real RGB pixel arrangementstructure is presented, where a minimum repeating unit includes twopixel pitches, one pixel pitch includes the first pixel unit, and theother pixel pitch includes the second pixel unit. Each of the firstpixel unit and the second pixel unit includes the first sub-pixel 1, thesecond sub-pixel 2 and the third sub-pixel 3. In other words, theminimum repeating unit totally includes six sub-pixels. Illustratively,the centers of gravity of the first sub-pixels 1 and the secondsub-pixels 2 are arranged in a same column and close to each other inthe first direction, and the centers of gravity of the third sub-pixels3 are arranged in another column. Through the pixel arrangementstructure, it is able to display an image at real 400 PPI or more, whichexceeds the capability of the retina of the human eye.

Illustratively, in the pixel units in any two adjacent columns, thefirst sub-pixel 1 and the second sub-pixel 2 in the first pixel unit inone column are arranged in an order opposite to the first sub-pixel 1and the second sub-pixel 2 in the second pixel unit in another column inthe first direction.

Based on the above-mentioned structure of the display substrate, theluminance brightness ratio of the first sub-pixel 1 is greater than theluminance brightness ratio of the second sub-pixel 2, the luminancebrightness ratio of the second sub-pixel 2 is greater than the luminancebrightness ratio of the third sub-pixel 3, the first sub-pixel 1 and thesecond sub-pixel 2 are located in the first column, and the thirdsub-pixel 3 is located in the second column, so that the brightnesscenter is located between the first sub-pixel 1 and the second sub-pixel2 in each pixel unit. In addition, the luminance brightness ratio of thefirst sub-pixel 1 is the greatest, so the brightness center in eachpixel unit is closer to the first sub-pixel 1.

In addition, the first sub-pixel 1 and the second sub-pixel 2 in thefirst pixel unit are arranged in an order opposite to the firstsub-pixel 1 and the second sub-pixel 2 in the second pixel unit in thefirst direction, and the distance between the first sub-pixels 1 is lessthan the distance between the second sub-pixels 2 in the first pixelunit and the second pixel unit adjacent to each other, so the brightnesscenters of the pixel units in a same row are arranged on a samehorizontal line extending in the second direction.

Moreover, the first sub-pixel 1 and the second sub-pixel 2 in each pixelunit in each column are arranged in a same column in the firstdirection, so the brightness centers of the pixel units in a same columnare arranged on a same vertical line extending in the first direction.

Hence, in the display substrate in the embodiments of the presentdisclosure, depending on the difference of a human eye visual system inthe sensitivities to the colors, the brightness centers of the whitepoints formed by the pixel units are arranged evenly at an equaldistance on a line in each of the horizontal direction, the longitudinaldirection and a 45° direction. As a result, it is able to achieve aneven display effect without any grains or serrations, thereby to solvethe problem in the related art where the display effect is adverselyaffected due to the sharing of the dummy pixels.

In addition, the luminance brightness ratio of each of the firstsub-pixel 1 and the second sub-pixel 2 is relatively high, so the firstsub-pixel 1 and the second sub-pixel 2 are arranged in the same column,so as to not only prevent the occurrence of the colored edge when thefirst sub-pixels 1 and the second sub-pixels 2 are arranged in differentcolumns, but also prevent the occurrence of the colored edge when thefirst sub-pixel 1 is combined with the third sub-pixel 3 or the secondsub-pixel 2 is combined with the third sub-pixel 3. The luminancebrightness ratio of the third sub-pixel 3 is low, and when the thirdsub-pixels 3 are arranged in another column, the brightness is evenignored by the human eye and no colored edge occurs, so it is able toimprove an overall display effect of the display substrate.

In addition, as shown in FIGS. 10 to 12 , in the display substrateaccording to the embodiments of the present disclosure, in the firstdirection, the first sub-pixel 1 and the second sub-pixel 2 are arrangedin the first column, and the third sub-pixel 3 is arranged in the secondcolumn. The first sub-pixels 1 and the second sub-pixels 2 in the pixelunits in each column are arranged in a same column in the firstdirection, and the third sub-pixels 3 in the pixel units in each columnare arranged in a same column in the first direction. At this time, thepixel apertures 4 in the mask for forming the sub-pixels are arrangedevenly in an array form in each direction, and a portion of a mask bodyof the mask between the two adjacent columns of pixel apertures 4extends in the first direction. As a result, it is able to provide themask with stronger mechanical stability, thereby to reduce thedifficulty in the manufacture of the FMM as well as the difficulty in astretching process.

As shown in FIGS. 5 and 8 , in some embodiments of the presentdisclosure, in the pixel units in each row, at least a part of firstsub-pixels 1 in the first pixel units are staggered from at least a partof second sub-pixels 2 in the second pixel units in the first direction,and in the pixel units in each row, at least a part of second sub-pixels2 in the first pixel units are staggered from at least a part of firstsub-pixels 1 in the second pixel units in the first direction.

Illustratively, relative positions of the first sub-pixel 1, the secondsub-pixel 2 and the third sub-pixel 3 in each pixel unit are constant,but at least a part of the sub-pixels in the pixel units in any twoadjacent columns have different heights in the longitudinal direction.

Illustratively, in the first pixel unit, the longitudinal height of thesecond sub-pixel 2 is greater than the longitudinal height of the firstpixel, and in the second pixel unit, the longitudinal height of thefirst sub-pixel 1 is greater than the longitudinal height of the secondsub-pixel 2. Illustratively, in the pixel units in a same row, thelongitudinal height of the second sub-pixel 2 in the first pixel unit isgreater than the longitudinal height of the first sub-pixel 1 in thesecond pixel unit. Illustratively, in the pixel units in a same row, thelongitudinal height of the first sub-pixel 1 in the first pixel unit isgreater than the longitudinal height of the second sub-pixel 2 in thesecond pixel unit. Illustratively, in the pixel units in a same row, thelongitudinal height of the first sub-pixel 1 in the first pixel unit issmaller than the longitudinal height of the first sub-pixel 1 in thesecond pixel unit.

Based on the above, the brightness centers of the pixel units in a samerow are arranged on a same horizontal line extending in the seconddirection, so it is able to achieve an even display effect without anygrains or serrations.

As shown in FIG. 4 , in some embodiments of the present disclosure, inthe pixel units in each row, at least a part of third sub-pixels 3 inthe first pixel units are staggered from at least a part of thirdsub-pixels 3 in the second pixel units in the first direction.

Illustratively, in the pixel units in each row, a longitudinal height ofthe third sub-pixel 3 in the first pixel unit is greater than alongitudinal height of the third sub-pixel 3 in the second pixel unit.

Illustratively, in the pixel units in each row, the longitudinal heightof the third sub-pixel 3 in the first pixel unit is smaller than thelongitudinal height of the third sub-pixel 3 in the second pixel unit.

Illustratively, in the first pixel unit and/or the second pixel unit,the longitudinal height of the third sub-pixel 3 is greater than thelongitudinal height of the first sub-pixel 1 and smaller than thelongitudinal height of the second sub-pixel 2.

Illustratively, in the first pixel unit and/or the second pixel unit,the longitudinal height of the third sub-pixel 3 is smaller than thelongitudinal height of the first sub-pixel 1 and greater than thelongitudinal height of the second sub-pixel 2.

Illustratively, in the first pixel unit and/or the second pixel unit,the longitudinal height of the third sub-pixel 3 is equal to thelongitudinal height of the first sub-pixel 1.

Illustratively, in the first pixel unit and/or the second pixel unit,the longitudinal height of the third sub-pixel 3 is equal to thelongitudinal height of the second sub-pixel 2.

As shown in FIG. 7 , in some embodiments of the present disclosure, thethird sub-pixels 3 in the pixel units in each row has a same height inthe first direction.

The luminance brightness ratio of the third sub-pixel 3 is very small,and the human eye is not sensitive thereto, so the influence caused bythe adjustment of the position of the third sub-pixel 3 on thebrightness center of the white point may be substantially omitted. Whenthe third sub-pixels 3 in the pixel units are arranged evenly in anarray form in the horizontal and longitudinal directions, it is alsoable to ensure the even arrangement of the brightness centers of thewhite points.

In some embodiments of the present disclosure, in the pixel units ineach row, a height of the third sub-pixel 3 in each first pixel unit isthe same as a height of the first sub-pixel 1 in each second pixel unitin the first direction.

Based on the above, it is able to provide the brightness centers evenly.

As shown in FIGS. 4 and 7 , in some embodiments of the presentdisclosure, in each of the first pixel units and the second pixel units,a pixel brightness center of a pixel including the first sub-pixel 1,the second sub-pixel 2 and the third sub-pixel 3 is located between thefirst sub-pixel 1 and the second sub-pixel 2, and a distance L1 betweenthe pixel brightness center and a center of gravity of the firstsub-pixel 1 in the pixel unit to which the first sub-pixel 1 belongssatisfies L1=(⅓) L, where L is a distance between the center of gravityof the first sub-pixel and a center of gravity of the second sub-pixelin the same pixel unit. In the pixel units in each row, the pixelbrightness center of the first pixel unit and the pixel brightnesscenter of the second pixel unit are located in the same row in thesecond direction, and the pixel brightness centers in the pixel unitsare arranged evenly in an array form in the first direction and thesecond direction.

Taking the pixel units in a j^(th) row and an i^(th) column as well asan (i+1)^(th) column as an example, a brightness center of the pixelunit in the j^(th) row and the i^(th) column is located on a lineconnecting the center of gravity of the first sub-pixel 1 and the centerof gravity of the second sub-pixel 2 at a position close to the firstsub-pixel by a distance of ⅓ of a total length of the line, and abrightness center of the pixel unit in the j^(th) row and the (i+1)^(th)column is located on a line connecting the center of gravity of thefirst sub-pixel 1 and the center of gravity of the second sub-pixel 2 ata position close to the first sub-pixel by a distance of ⅓ of a totallength of the line. The brightness centers of the pixel units in thei^(th) column and the (i+1)^(th) column are arranged along the seconddirection.

Based on the above, it is able to facilitate the even distribution ofthe brightness centers.

In some embodiments of the present disclosure, the pixel units in eachcolumn includes a plurality of first pixel units or a plurality ofsecond pixel units.

Based on the above, it is able to facilitate the even distribution ofthe sub-pixels in the pixel units, thereby to improve the display effectof the display substrate in a better manner.

As shown in FIGS. 5 and 8 , in some embodiments of the presentdisclosure, the first sub-pixels 1 and the second sub-pixels 2 arearranged alternately and spaced apart from each other at a same intervalin the pixel units in each column.

Based on the above, it is able to facilitate the even distribution ofthe sub-pixels in the pixel units, thereby to improve the display effectof the display substrate in a better manner.

In some embodiments of the present disclosure, the first pixel units andthe second pixel units are arranged alternately in the first directionin the pixel units in each column.

Based on the above, it is able to achieve the even display of thedisplay substrate, thereby to improve the display effect of the displaysubstrate in a better manner.

As shown in FIGS. 5 and 8 , in some embodiments of the presentdisclosure, the first sub-pixel 1, the second sub-pixel 2 and the thirdsub-pixel 3 are each of a rectangular shape, and a long side of thethird sub-pixel 3 extends in the first direction.

Based on the above, it is able to not only improve the mechanicalstability of the FMM but also facilitate the adjustment of an apertureratio of each sub-pixel.

It should be appreciated that, a red light-emitting material has a longservice life, and a blue light-emitting material has a short servicelife, so it is able to provide a display panel with a same attenuationlevel through reducing an aperture ratio of the red sub-pixel andincreasing an aperture ratio of the blue sub-pixel.

As shown in FIGS. 4, 5, 7 and 8 , in some embodiments of the presentdisclosure, the first sub-pixel 1 includes a green sub-pixel, the secondsub-pixel 2 includes a red sub-pixel the second sub-pixel 2 includes ared sub-pixel, and the third sub-pixel 3 includes a blue sub-pixel.

Illustratively, when the first sub-pixel 1 includes a green sub-pixel G,the second sub-pixel 2 includes a red sub-pixel R and the thirdsub-pixel 3 includes a blue sub-pixel B, i.e., the R sub-pixel and the Gsub-pixel having a higher luminance brightness ratio are arranged in asame column, so it is able to prevent the occurrence of the colored edgewhen the R sub-pixel and the G sub-pixel are each arranged in a separatecolumn, or the R sub-pixel or the G sub-pixel is combined with the Bsub-pixel. In addition, the B sub-pixels have low brightness and arearranged in a separate column, and they are even ignored by the humaneye, so no colored edge may occur.

As shown in FIG. 4 , in some embodiments of the present disclosure, ineach pixel unit, a distance between a center of gravity of the firstsub-pixel 1 and a center of gravity of the second sub-pixel 2, adistance between the center of gravity of the first sub-pixel 1 and acenter of gravity of the third sub-pixel 3, and a distance between thecenter of gravity of the second sub-pixel 2 and the center of gravity ofthe third sub-pixel 3 are the same.

Based on the above, it is able to achieve the even display of thedisplay substrate, thereby to improve the display effect of the displaysubstrate in a better manner.

The present disclosure further provides in some embodiments a displayapparatus including the above-mentioned display substrate.

It should be appreciated that, the display apparatus may be any productor member having a display function, such as television, display,digital photo frame, mobile phone or tablet computer.

Based on the above-mentioned display substrate, the luminance brightnessratio of the first sub-pixel 1 is greater than the luminance brightnessratio of the second sub-pixel 2, the luminance brightness ratio of thesecond sub-pixel 2 is greater than the luminance brightness ratio of thethird sub-pixel 3, the first sub-pixel 1 and the second sub-pixel 2 arelocated in the first column, and the third sub-pixel 3 is located in thesecond column, so that the brightness center is located between thefirst sub-pixel 1 and the second sub-pixel 2 in each pixel unit. Inaddition, the luminance brightness ratio of the first sub-pixel 1 is thegreatest, so the brightness center in each pixel unit is closer to thefirst sub-pixel 1.

In addition, the first sub-pixel 1 and the second sub-pixel 2 in thefirst pixel unit are arranged in an order opposite to the firstsub-pixel 1 and the second sub-pixel 2 in the second pixel unit in thefirst direction, and the distance between the first sub-pixels 1 is lessthan the distance between the second sub-pixels 2 in the first pixelunit and the second pixel unit adjacent to each other, so the brightnesscenters of the pixel units in a same row are arranged on a samehorizontal line extending in the second direction.

Moreover, the first sub-pixel 1 and the second sub-pixel 2 in each pixelunit in each column are arranged in a same column in the firstdirection, so the brightness centers of the pixel units in a same columnare arranged on a same vertical line extending in the first direction.

Hence, in the display substrate in the embodiments of the presentdisclosure, depending on the difference of a human eye visual system inthe sensitivities to the colors, the brightness centers of the whitepoints formed by the pixel units are arranged evenly at an equaldistance on a line in each of the horizontal direction, the longitudinaldirection and a 45° direction. As a result, it is able to achieve aneven display effect without any grains or serrations, thereby to solvethe problem in the related art where the display effect is adverselyaffected due to the sharing of the dummy pixels.

In addition, the luminance brightness ratio of each of the firstsub-pixel 1 and the second sub-pixel 2 is relatively high, so the firstsub-pixel 1 and the second sub-pixel 2 are arranged in the same column,so as to not only prevent the occurrence of the colored edge when thefirst sub-pixels 1 and the second sub-pixels 2 are arranged in differentcolumns, but also prevent the occurrence of the colored edge when thefirst sub-pixel 1 is combined with the third sub-pixel 3 or the secondsub-pixel 2 is combined with the third sub-pixel 3. The luminancebrightness ratio of the third sub-pixel 3 is low, and when the thirdsub-pixels 3 are arranged in another column, the brightness is evenignored by the human eye and no colored edge occurs, so it is able toimprove an overall display effect of the display substrate.

In addition, in the display substrate according to the embodiments ofthe present disclosure, in the first direction, the first sub-pixel 1and the second sub-pixel 2 are arranged in the first column, and thethird sub-pixel 3 is arranged in the second column. The first sub-pixels1 and the second sub-pixels 2 in the pixel units in each column arearranged in a same column in the first direction, and the thirdsub-pixels 3 in the pixel units in each column are arranged in a samecolumn in the first direction. At this time, the pixel apertures 4 inthe mask for forming the sub-pixels are arranged evenly in an array formin each direction, and a portion of a mask body of the mask between thetwo adjacent columns of pixel apertures 4 extends in the firstdirection. As a result, it is able to provide the mask with strongermechanical stability, thereby to reduce the difficulty in themanufacture of the FMM as well as the difficulty in a stretchingprocess.

When the display apparatus includes the above-mentioned displaysubstrate, it also has the above-mentioned beneficial effects, whichwill not be particularly defined herein.

As shown in FIGS. 6, 9 and 10 to 12 , the present disclosure furtherprovides in some embodiments a mask which includes a mask body and aplurality of pixel apertures 4 formed in the mask body. The plurality ofpixel apertures 4 includes pixel apertures 4 arranged in columns in asecond direction, the pixel apertures 4 in each column include aplurality of pixel apertures 4 arranged in a first direction crossingthe second direction, and a portion of the mask body between twoadjacent columns of pixel apertures 4 extends in the first direction.

Illustratively, the mask body is of grid-like shape, a portion of themask body between two adjacent columns of pixel apertures 4 extends inthe first direction, and at least a portion of the mask body between twoadjacent rows of pixel apertures 4 extends in the second direction.Illustratively, the portion of the mask body between two adjacentcolumns of pixel apertures 4 has a same width in the second direction.Illustratively, the portion of the mask body between two adjacentcolumns of pixel apertures 4 has a same length in the first direction.

Illustratively, the pixel aperture 4 is of a rectangular shape.Illustratively, the plurality of pixel apertures 4 is distributed in anarray form.

It should be appreciated that, the portion of the mask body between thetwo adjacent columns of pixel apertures 4 (i.e., an FMM rib) is ametallic raw material region between the pixel apertures 4 of the mask,and in the stretching process of the FMM, the rib in a stretchingdirection is a portion to which a force is applied to through which aforce is transferred, so the stretching process of the FMM is greatlyaffected by the rib.

According to the mask in the embodiments of the present disclosure, theplurality of pixel apertures 4 is arranged evenly in an array form ineach direction, and the portion of the mask body between the twoadjacent columns of pixel apertures 4 extends in the first direction(i.e., the stretching direction), so it is able to provide the mask withstronger mechanical stability, thereby to reduce the difficulty in themanufacture of the FMM as well as the difficulty in the stretchingprocess.

As shown in FIGS. 6, 9, 10, and 11 , in some embodiments of the presentdisclosure, the pixel apertures 4 in odd-numbered columns are at leastpartially staggered from the pixel apertures 4 in even-numbered columnsin the first direction.

Based on the above, it is able to form the first sub-pixel 1, the secondsub-pixel 2 and the third sub-pixel 3 in the display substrate throughthe mask.

As shown in FIG. 12 , in some embodiments of the present disclosure, theplurality of pixel apertures 4 includes a plurality of pixel apertures 4arranged in rows in the first direction, the pixel apertures 4 in eachrow include a plurality of pixel apertures 4 arranged in the seconddirection, and the pixel apertures 4 in each row have a same height inthe first direction.

Based on the above, it is able to form the third sub-pixel 3 in thedisplay substrate through the mask.

The present disclosure further provides in some embodiments a method formanufacturing a display substrate. The display substrate includes a basesubstrate and a plurality of pixel units arranged in an array form onthe base substrate, the plurality of pixel units is arranged in rows andcolumns, and each pixel unit at least includes a first sub-pixel 1, asecond sub-pixel 2 and a third sub-pixel 3. The method includes formingat least one of the first sub-pixel 1, the second sub-pixel 2 and thethird sub-pixel 3 through the above-mentioned mask. The first sub-pixel1 and the second sub-pixel 2 are located in a first column, the thirdsub-pixel 3 is located in a second column, a luminance brightness ratioof the first sub-pixel 1 is greater than a luminance brightness ratio ofthe second sub-pixel 2, and the luminance brightness ratio of the secondsub-pixel 2 is greater than a luminance brightness ratio of the thirdsub-pixel 3. The plurality of pixel units includes a plurality of firstpixel units and a plurality of second pixel units. In the first pixelunit, the first sub-pixel 1 is close to a first end of the thirdsub-pixel 3, and the second sub-pixel 2 is close to a second end of thethird sub-pixel 3. In the second pixel unit, the first sub-pixel 1 isclose to a second end of the third sub-pixel 3, and the second sub-pixel2 is close to a first end of the third sub-pixel 3. The first pixelunits and the second pixel units are arranged alternately in the pixelunits in each row, and in the first pixel unit and the second pixel unitadjacent to each other, a distance between the first sub-pixels 1 isless than a distance between the second sub-pixels 2. The firstsub-pixels 1 and the second sub-pixels 2 in the pixel units in eachcolumn are located in a same column.

Illustratively, the first sub-pixel 1, the second sub-pixel 2, and thethird sub-pixel 3 are formed through evaporation using theabove-mentioned mask.

According to the display substrate manufactured by the above-mentionedmethod, the luminance brightness ratio of the first sub-pixel 1 isgreater than the luminance brightness ratio of the second sub-pixel 2,the luminance brightness ratio of the second sub-pixel 2 is greater thanthe luminance brightness ratio of the third sub-pixel 3, the firstsub-pixel 1 and the second sub-pixel 2 are located in the first column,and the third sub-pixel 3 is located in the second column, so that thebrightness center is located between the first sub-pixel 1 and thesecond sub-pixel 2 in each pixel unit. In addition, the luminancebrightness ratio of the first sub-pixel 1 is the greatest, so thebrightness center in each pixel unit is closer to the first sub-pixel 1.

In addition, the first sub-pixel 1 and the second sub-pixel 2 in thefirst pixel unit are arranged in an order opposite to the firstsub-pixel 1 and the second sub-pixel 2 in the second pixel unit in thefirst direction, and the distance between the first sub-pixels 1 is lessthan the distance between the second sub-pixels 2 in the first pixelunit and the second pixel unit adjacent to each other, so the brightnesscenters of the pixel units in a same row are arranged on a samehorizontal line extending in the second direction. Moreover, the firstsub-pixel 1 and the second sub-pixel 2 in each pixel unit in each columnare arranged in a same column in the first direction, so the brightnesscenters of the pixel units in a same column are arranged on a samevertical line extending in the first direction.

Hence, in the display substrate manufactured using the method in theembodiments of the present disclosure, depending on the difference of ahuman eye visual system in the sensitivities to the colors, thebrightness centers of the white points formed by the pixel units arearranged evenly at an equal distance on a line in each of the horizontaldirection, the longitudinal direction and a 45° direction. As a result,it is able to achieve an even display effect without any grains orserrations, thereby to solve the problem in the related art where thedisplay effect is adversely affected due to the sharing of the dummypixels.

In addition, the luminance brightness ratio of each of the firstsub-pixel 1 and the second sub-pixel 2 is relatively high, so the firstsub-pixel 1 and the second sub-pixel 2 are arranged in the same column,so as to not only prevent the occurrence of the colored edge when thefirst sub-pixels 1 and the second sub-pixels 2 are arranged in differentcolumns, but also prevent the occurrence of the colored edge when thefirst sub-pixel 1 is combined with the third sub-pixel 3 or the secondsub-pixel 2 is combined with the third sub-pixel 3. The luminancebrightness ratio of the third sub-pixel 3 is low, and when the thirdsub-pixels 3 are arranged in another column, the brightness is evenignored by the human eye and no colored edge occurs, so it is able toimprove an overall display effect of the display substrate.

In addition, in the display substrate manufactured using the methodaccording to the embodiments of the present disclosure, in the firstdirection, the first sub-pixel 1 and the second sub-pixel 2 are arrangedin the first column, and the third sub-pixel 3 is arranged in the secondcolumn. The first sub-pixels 1 and the second sub-pixels 2 in the pixelunits in each column are arranged in a same column in the firstdirection, and the third sub-pixels 3 in the pixel units in each columnare arranged in a same column in the first direction. At this time, thepixel apertures 4 in the mask for forming the sub-pixels are arrangedevenly in an array form in each direction, and a portion of a mask bodyof the mask between the two adjacent columns of pixel apertures 4extends in the first direction. As a result, it is able to provide themask with stronger mechanical stability, thereby to reduce thedifficulty in the manufacture of the FMM as well as the difficulty in astretching process.

It should be further appreciated that, the above embodiments have beendescribed in a progressive manner, and the same or similar contents inthe embodiments have not been repeated, i.e., each embodiment has merelyfocused on the difference from the others. Especially, the methodembodiments are substantially similar to the product embodiments, andthus have been described in a simple manner.

Unless otherwise defined, any technical or scientific term used hereinshall have the common meaning understood by a person of ordinary skills.Such words as “first” and “second” used in the specification and claimsare merely used to differentiate different components rather than torepresent any order, number or importance. Similarly, such words as“one” or “one of” are merely used to represent the existence of at leastone member, rather than to limit the number thereof. Such words as“include” or “including” intends to indicate that an element or objectbefore the word contains an element or object or equivalents thereoflisted after the word, without excluding any other element or object.Such words as “connect/connected to” or “couple/coupled to” may includeelectrical connection, direct or indirect, rather than to be limited tophysical or mechanical connection. Such words as “on”, “under”, “left”and “right” are merely used to represent relative position relationship,and when an absolute position of the object is changed, the relativeposition relationship will be changed too.

It should be appreciated that, in the case that such an element aslayer, film, region or substrate is arranged “on” or “under” anotherelement, it may be directly arranged “on” or “under” the other element,or an intermediate element may be arranged therebetween.

In the above description, the features, structures, materials orcharacteristics may be combined in any embodiment or embodiments in anappropriate manner.

The above embodiments are for illustrative purposes only, but thepresent disclosure is not limited thereto. Obviously, a person skilledin the art may make further modifications and improvements withoutdeparting from the spirit of the present disclosure, and thesemodifications and improvements shall also fall within the scope of thepresent disclosure.

1. A display substrate, comprising a base substrate and a plurality ofpixel units arranged in an array form on the base substrate, whereineach pixel unit at least comprises a first sub-pixel, a second sub-pixeland a third sub-pixel, a luminance brightness ratio of the firstsub-pixel is greater than a luminance brightness ratio of the secondsub-pixel, and the luminance brightness ratio of the second sub-pixel isgreater than a luminance brightness ratio of the third sub-pixel; in afirst direction, the first sub-pixel and the second sub-pixel arelocated in a first column, the third sub-pixel is located in a secondcolumn, and the first column and the second column are arranged in asecond direction crossing the first direction; the plurality of pixelunits comprises a plurality of first pixel units and a plurality ofsecond pixel units, and the first sub-pixel and the second sub-pixel inthe first pixel unit are arranged in an order opposite to the firstsub-pixel and the second sub-pixel in the second pixel unit in the firstdirection; and the plurality of pixel units is arranged in rows andcolumns, the first pixel units and the second pixel units in each roware arranged alternately, a distance between the first sub-pixels isless than a distance between the second sub-pixels in the first pixelunit and the second pixel unit adjacent to each other, and the firstsub-pixels and the second sub-pixels in the pixel units in each columnare arranged in a same column in the first direction.
 2. The displaysubstrate according to claim 1, wherein in the pixel units in each row,at least a part of first sub-pixels in the first pixel units arestaggered from at least a part of second sub-pixels in the second pixelunits in the first direction, and in the pixel units in each row, atleast a part of second sub-pixels in the first pixel units are staggeredfrom at least a part of first sub-pixels in the second pixel units inthe first direction.
 3. The display substrate according to claim 1,wherein in the pixel units in each row, at least a part of thirdsub-pixels in the first pixel units are staggered from at least a partof third sub-pixels in the second pixel units in the first direction. 4.The display substrate according to claim 1, wherein the third sub-pixelsin the pixel units in each row have a same height in the firstdirection.
 5. The display substrate according to claim 1, wherein in thepixel units in each row, a height of the third sub-pixel in each firstpixel unit is the same as a height of the first sub-pixel in each secondpixel unit in the first direction.
 6. The display substrate according toclaim 1, wherein in each of the first pixel units and the second pixelunits, a pixel brightness center of a pixel comprising the firstsub-pixel, the second sub-pixel and the third sub-pixel is locatedbetween the first sub-pixel and the second sub-pixel, and a distance L1between the pixel brightness center and a center of gravity of the firstsub-pixel in the pixel unit to which the first sub-pixel belongssatisfies L1=(⅓) L, where L is a distance between the center of gravityof the first sub-pixel and a center of gravity of the second sub-pixelin the same pixel unit, wherein in the pixel units in each row, thepixel brightness center of the first pixel unit and the pixel brightnesscenter of the second pixel unit are located in the same row in thesecond direction, and the pixel brightness centers in the pixel unitsare arranged evenly in an array form in the first direction and thesecond direction.
 7. The display substrate according to claim 1, whereinthe pixel units in each column comprises a plurality of first pixelunits or a plurality of second pixel units.
 8. The display substrateaccording to claim 7, wherein the first sub-pixels and the secondsub-pixels are arranged alternately and spaced apart from each other ata same interval in the pixel units in each column.
 9. The displaysubstrate according to claim 1, wherein the first pixel units and thesecond pixel units are arranged alternately in the first direction inthe pixel units in each column.
 10. The display substrate according toclaim 1, wherein the first sub-pixel, the second sub-pixel and the thirdsub-pixel are each of a rectangular shape, and a long side of the thirdsub-pixel extends in the first direction.
 11. The display substrateaccording to claim 1, wherein the first sub-pixel comprises a greensub-pixel, the second sub-pixel comprises a red sub-pixel and the thirdsub-pixel comprises a blue sub-pixel.
 12. The display substrateaccording to claim 1, wherein in each pixel unit, a distance between acenter of gravity of the first sub-pixel and a center of gravity of thesecond sub-pixel, a distance between the center of gravity of the firstsub-pixel and a center of gravity of the third sub-pixel, and a distancebetween the center of gravity of the second sub-pixel and the center ofgravity of the third sub-pixel are the same.
 13. A display apparatus,comprising the display substrate according to claim
 1. 14. A mask,comprising a mask body and a plurality of pixel apertures formed in themask body, wherein the plurality of pixel apertures comprises pixelapertures arranged in columns in a second direction, the pixel aperturesin each column comprise a plurality of pixel apertures arranged in afirst direction crossing the second direction, and a portion of the maskbody between two adjacent columns of pixel apertures extends in thefirst direction.
 15. The mask according to claim 14, wherein the pixelapertures in odd-numbered columns are at least partially staggered fromthe pixel apertures in even-numbered columns in the first direction. 16.The mask according to claim 14, wherein the plurality of pixel aperturescomprises a plurality of pixel apertures arranged in rows in the firstdirection, the pixel apertures in each row comprise a plurality of pixelapertures arranged in the second direction, and the pixel apertures ineach row have a same height in the first direction.
 17. A method formanufacturing a display substrate, wherein the display substratecomprises a base substrate and a plurality of pixel units arranged in anarray form on the base substrate, the plurality of pixel units isarranged in rows and columns, and each pixel unit at least comprises afirst sub-pixel, a second sub-pixel and a third sub-pixel, wherein themethod comprises forming at least one of the first sub-pixel, the secondsub-pixel and the third sub-pixel through a mask, the mask comprises amask body and a plurality of pixel apertures formed in the mask body,the plurality of pixel apertures comprises pixel apertures arranged incolumns in a second direction, the pixel apertures in each columncomprise a plurality of pixel apertures arranged in a first directioncrossing the second direction, and a portion of the mask body betweentwo adjacent columns of pixel apertures extends in the first direction;the first sub-pixel and the second sub-pixel are located in a firstcolumn, the third sub-pixel is located in a second column, a luminancebrightness ratio of the first sub-pixel is greater than a luminancebrightness ratio of the second sub-pixel, and the luminance brightnessratio of the second sub-pixel is greater than a luminance brightnessratio of the third sub-pixel; the plurality of pixel units comprises aplurality of first pixel units and a plurality of second pixel units; inthe first pixel unit, the first sub-pixel is close to a first end of thethird sub-pixel, and the second sub-pixel is close to a second end ofthe third sub-pixel; in the second pixel unit, the first sub-pixel isclose to a second end of the third sub-pixel, and the second sub-pixelis close to a first end of the third sub-pixel; the first pixel unitsand the second pixel units are arranged alternately in the pixel unitsin each row, and in the first pixel unit and the second pixel unitadjacent to each other, a distance between the first sub-pixels is lessthan a distance between the second sub-pixels; and the first sub-pixelsand the second sub-pixels in the pixel units in each column are locatedin a same column.
 18. The display apparatus according to claim 13,wherein in the pixel units in each row, at least a part of firstsub-pixels in the first pixel units are staggered from at least a partof second sub-pixels in the second pixel units in the first direction,and in the pixel units in each row, at least a part of second sub-pixelsin the first pixel units are staggered from at least a part of firstsub-pixels in the second pixel units in the first direction.
 19. Thedisplay apparatus according to claim 13, wherein in the pixel units ineach row, at least a part of third sub-pixels in the first pixel unitsare staggered from at least a part of third sub-pixels in the secondpixel units in the first direction.
 20. The display apparatus accordingto claim 13, wherein the third sub-pixels in the pixel units in each rowhave a same height in the first direction.